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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ant;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Path;
import java.io.File;
/**
* Single input single output class. Execution is controlled
* by modification timestamp of the input and output files.
*
* Implementation classes must implement {@link #createOutput()}
*
*/
public abstract class SingleInputOutputTask extends Task {
private String mInput;
private String mOutput;
public void setInput(Path inputPath) {
mInput = TaskHelper.checkSinglePath("input", inputPath);
}
public void setOutput(Path outputPath) {
mOutput = TaskHelper.checkSinglePath("output", outputPath);
}
@Override
public final void execute() throws BuildException {
if (mInput == null) {
throw new BuildException("Missing attribute input");
}
if (mOutput == null) {
throw new BuildException("Missing attribute output");
}
// check if there's a need for the task to run.
File outputFile = new File(mOutput);
if (outputFile.isFile()) {
File inputFile = new File(mInput);
if (outputFile.lastModified() >= inputFile.lastModified()) {
System.out.println(String.format(
"Run cancelled: no changes to input file %1$s",
inputFile.getAbsolutePath()));
return;
}
}
createOutput();
}
protected abstract void createOutput() throws BuildException;
protected String getInput() {
return mInput;
}
protected String getOutput() {
return mOutput;
}
}
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